Document Open using Stream

I see there are two methods for opening a document

public int Open( String path, String opassword, String upassword )
public int OpenMem( byte[] data, String opassword, String upassword )

it there a chance for you to provide also a method that uses streams instead of a byte[]?

What we are intrested in is having the pdfs stored encrypted (using our own implementation) on the sd card and decrypting them on the fly (without using a temp-decrypted file). The byte[] method could work but since some of our pdfs are 80mb big, i doubt that android phones can hold all that in memory.

i'm thinking.
maybe i need declare a new JAVA interface.
but... how the performance of java decrypting?

The performance is an issue i guess but it depends on the actual algorithm and shouldn't bother you. One could just perform a simple xor every x number of bytes (so it;s really a scrambled file) and this will have no impact on the reading if we are talking about streams.

Working on the same task, so we're waiting for solution too.